Generic 2 Pack 1500mAh Cordless Phone Battery for Panasonic P-P511 Compatible for Panasonic KX-TGA273S KXTGA273 KX-TGA272 KXTGA270S KXTGA270 KX-TG5110M KXTG5110 KXTG5100M KXTG5100 KXTG2770 KXTG2750 KXTG2740S This replacement battery has an integrated microchip that prevents overcharging and lengthens battery life. High quality 3.6V 1500mAh Standard battery. Works with multiple models. 100% compatible with Original Battery. Great bargain with excellent quality guaranteed.